Electronic type power-saving alternating current contactor

Abstract

The invention discloses an electronic type power-saving alternating current contactor which comprises an additional electronic unit and a general alternating current contactor body. The general alternating current contactor body is composed of normally closed contacts, normally open contacts, a movable iron core, a fixed iron core, a reset spring and a magnet exciting coil. The additional electronic unit is a four-port network and is provided with a first input port, a second input port, a first output port and a second output port, the first input port and the second input port are connected with the first end and the second end of an AC voltage respectively, the first output port and the second output port are connected with the first end and the second end of the magnet exciting coil respectively, a switch circuit and an energy storage circuit are arranged inside the additional electronic unit, one end of the switch circuit is connected with the first input port, the other end of the switch circuit is connected with the first output port and one end of the energy storage circuit, the other end of the energy storage circuit is connected with the second output port and the second input port, the switch circuit is composed of a gas discharge tube, and the energy storage circuit is composed of a capacitor.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to an "electronic power-saving AC contactor" transformed from only two electronic devices. Background technique [0002] AC contactor is a low-voltage electrical appliance that is widely used. As of 2012, there are as many as 1 billion AC contactors running online in my country, and the number of AC contactors is increasing at a rate of 80 million per year. Its working principle is to use the electromagnet to drive the moving contact (moving contact) and the static contact (moving contact) to close or separate, so as to achieve the purpose of connecting or cutting off the circuit. It is suitable for starting or controlling three-phase induction motors and other electrical equipment. [0003] figure 1 It is the working principle diagram of the traditional AC contactor. This traditional AC contactor is mainly composed of a moving iron core, a static iron core, an ex...

AI Technical Summary

Problems solved by technology

[0010] 1. Unnecessary power consumption: As mentioned above, in the pull-in and holding stages, the excitation coil of the traditional AC contactor is connected with the "same" AC voltage, which makes the holding power too large, resulting in unnecessary electric energy loss;

[0011] 2. Heating: The evil result of unnecessary power loss is "heating and heating". In severe cases, it will even burn the excitation coil of the traditional AC contactor;

[0013] 4. There is annoying AC noise;

[0014] 5. Low power factor

[0017] 1. The structure is complex and difficult to implement;

[0018] 2. There are too many electronic devices used, and the electronic circuit is too complicated; the "AC contactor power saver" controlled by a single-chip microcomputer is susceptible to electromagnetic interference from the AC contactor itself or electrical appliances such as motors, resulting in internal program execution errors and "flying jumps". "Miscontrol - this miscontrol can lead to catastrophe on some occasions!

[0019] 3. The price of the products produced is too high. For example, the price of the QXJB AC contactor power saver produced by a certain company in Zhuhai City, Guangdong Province is as high as 1,500 yuan per set! The price of a small AC contactor is only more than 20 yuan, and the price of a medium-sized AC contactor is only a few hundred yuan. Such an expensive "QXJB AC contactor power saver" will make very few users

[0020] 4. Due to the complex electronic circuit and many electronic devices used, it is difficult to integrate the power saving control part of the AC contactor with the AC contactor. Inconvenient, troublesome wiring

[0021] 5. Due to the complex electronic circuit and many electronic devices used, the power consumption of the power-saving control part of the AC contactor (AC-DC conversion loss, IC power consumption, actuator power consumption, etc.) will increase. even to the point where it is comparable to the holding power of a small contactor

The main reason is that the price of energy-saving contactors is relatively expensive, and users cannot accept the one-time investment. The country needs to increase policy efforts in the promotion of energy-saving contactors to promote the wide application of energy-saving contactors.”

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